Rapid depolarization of a neuron generally involves a flow of ______ ions _______ a neuron.
A. potassium/into
B. potassium/out of
C. sodium/into
D. sodium/out of
Answer: C. sodium/into
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The progressive decline in density and increase in biomass of remaining individuals in a population is known as ________-thinning
Fill in the blank(s) with correct word
__________ is the wood of flowering plants and __________ is the wood of conifers
a. Hardwood; softwood b. Summer wood; spring wood c. Softwood; hardwood d. Spring wood; summer wood e. Heartwood; softwood
Specialized food-conducting cells in vascular plants, known as ________, distribute sugars and other substances throughout the plant.
A. Phloem B. Stomata C. Tracheids D. Meristems E. Xylem
Which experiment might be performed by a biologist who is interested in determining which plant organs (stems, buds, leaves, etc.) are responsible for sensing photoperiod?
A) Remove the apical meristems from different parts of the plant. B) Measure auxin levels in different parts of the plant before and after exposure to light. C) Cover different plant organs with a foil covering to prevent light exposure. D) Expose the plants to different wavelengths of light.